bellman



. 2 Sheds-Sheet 1; 0. BELLMAN & J. W. GARVER.

Hot Air Furnace.

- Patend Feby 22, 1870. I

Limognpher, wnhington. D.C.

' furnace.

gg-aient dattie.

OSCAR BELLMAN AND JOHN W. GA'RVER OF HAGERSTOWN, MARYLAND.

Letters Patent No.l 100,107, dated February 22, 1870.v

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern Be it known that we, OSCAR BELLMAN and JOHN W. GARVER, of Hagerstown, in the county of Washington, and State of Maryland, have invented a new and useful Improvement in Furnaces for Heat-ing Dwellings and other Buildings; and we do hereby declare that the following is a full land exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

In the accompanying drawings- Figure 1 is a perspective view of our improved furnace.

Figure 2 is a plan of the same.

Figure 3, sheet 2, is a transverse section.

Figure 4, sheet A2, is a longitudinal section.

Figure is a detached view, showing two tubes, with mortar closing the space between them.

Our invention consists ot'a peculiar novel construction and arrangement of furnace for heating dwelling'- houses and other buildings.

In the construction of our improved furnace, we make the walls of the same of brick work, and insert therein several series of air tubes, which not only serve for passage of heated air, but also they form partitions which serve as the s'ides of the (lues, as will be hereafter fully described.

Our furnace may be m`ade in the form shown in fig. l, thechamber for heated air being in front at A, with the tubes B for conducting the heated air to the room or rooms to be heated.`

The fuel is introduced at O.

-The fire-chamber is situated at D, iig. 2, and upon the walls E of this lire-chamber rest a series' ofv airtubes, F, tig. 3, sheet 2.

Above the lire-chamber is` an arched series of airtubes, G, with their ends resting in the walls of the This arched series is curved downward and then inwai'd nearly to the walls of the lire-chamber.

Athird series of air-tubes, H, is placed below the two series above described.

All these series of tubes form thesides ofthe tlues, and the spaces between t-he tubes must be closed airtight by mortar made of tire-clay or other .suitablexnaterial, as shown in fig. 5. v

The smoke from the tire takes the course indicated by arrows, and escapes in two currents near the bottom of the furnace, when the two currents unite and entert-he chimney.

The pure air enters the air-tubes in the rear of the furnace, as indicated by arrows in Iig. 4, sheet 2, and passes directly through the furnace to the airfchamber A.

All the air-tubes'are set obliquely, the ends near the air-chamber being elevated more or less, in order to set. the current of air always inward toward the air-chamber.v The degree of' elevation is varied according toy circumstances. We generally prefer to set the tubes from one to fifty-tive degrees inclination from a horizontal lille.

The pipes in our furnace may be made in part of cast-iron and in part of sheet iron, the tubes, which f are exposed to great heat and liable to burn, being better when made of cast-iron.

A'.lhe position of the series of pipes may be somewhat varied without departing from jour invention, though we prefer the above-described arrangement. By placing the main upper series in an arch, the central and upper tubes are far enough from the fire not to'be burned, and the sides of the arch are not too By our arrangement of the series Y far from the lire. of tubes both sides of the fines are formed of series of tubes, thus rapidly imparting. heat to the air within the tubes. e

A furnace may be made similar to ours withv walls of cast-iron,'but we prefer masonry.

Having described our invention,-

1. The arrangement cfa series of air-tubes, F, above the lire-chamber, in combination with -the hot-air chamber A, when placed in front of re-chamber, y

substantially as set forth.

2. An arched series of tubes, G, above the fire, substantially as set forth.

3. A smoke-tlue, when'both sides of the same within the furnace are made entirely or chiefly of series of air-tube's, substantially as set forth.

OSCAR BELLMAN. JOHN W. GARVER. Witnesses:

SAML. F. Zutaten,l NATHANIEL Saunen. 

